Permeability tuner mechanism



May 23, 1950 w. A. SCHAPER PERMEABILITY TUNER MECHANISM 2 SheetS-Sheet 1 Filed April 19, 1947 I J zrzzza 414772292 May 23, 1950 w. A. SCHAPER PERMEABILITY TUNER MECHANISM 2 Sheets-Sheet 2 Filed April 19, 1.947

Q0 75Wz E /f3 uJ zwfi 1 6% w 6 6 VA H l v 3 M 5 w m a Patented May 23, 1950 UNITED STATES PATENT OFFICE William .Ar. Schaper, Phoenix, Aria, ,assignonto Aladdinlndusiries, Incorporated, a corporation of Illinois Application. Apr-i119, 1947*, Serial No. 742.563

4 Claims (CI. 74-40)?) This invention is directed tolimprovements, in permeability. tuning v mechanisms.. for ,radi'o purposes ,whereina. ierroemagnetic .core. or cores are moved. relatively to. an inductance coil or coils. to vary the inductancethereof tor. permeability tun.- in purposes.

This application. lsqacontinuationin part ,of, my copending. application Patent No. v2,503,220 issued Aprile, 1 0, and. discloses and claims a furtheriorm of permeability. tuning mechanism than those shown in copending application.

The principal object, ofthisinventi'on .isto provide an improved permeability tuning mechanism having, .arnonglfither features, an improved mechanism for; convertingrotary motion. of a control shaft into longitudinal. movement of the ferroemagnetic cores with respect to the associated inductance coils.

Incarrylng out this object of the invention the permeability tuning mechanism. preferably includes frame having-parallel side walls, coil forms supported by said frame between the side walls and parallel thereto, tuning cores movable axially in said. coil forms, a cross-head extending transversely-of said side walls and mounted for monementlongitudinally of said.- side walls, and rods connecting said eross-headrito said'tun-ing core. A pair of. parallel extensions are provided onathe crosshead*ad;iacent the side. walls: and these extensions are preferably at least ,as; long asthe longitudinal. movementof the; crosse'head. A. shaft extends between theside: vial-Island is provided withapairof drums in alignment with the cross-head extensions andbetweenthe ends thereof. Aflex-ible band v is provided-around each ofithe. drums and connected. to theyends of the associated .crossrhead, extensions. for imparting longitudinal. movement .to the. crosswheadupon rotarymovement of .the shaft.-

Spring means .may .beprovided forv tensioning the flexible bands andfor securing the same. .to the, drums. By reason of this. construction the cross-head is atall times maintained at right angles to the side walls of the. frame to provide for equal linear movements of the tuning cores upon rotation of the control shaft for obtaining accurate permeabilitytuning, for radio purposes.

An arcuate slot may be provided in theslde wall adjacent one of the drums'andjthe drum may be provided with a projection extending into the slot for limiting rotation of :the shaft and hence longitudinal movement of the tuning core.

Further objects of this invention reside in the details of construction and the cooperative relation between the component parts of the permeability tuning mechanism.

= material;

Other objects and. advantages will. become apparent tothose skilled inthe. art upon reference to the... accompanying specification, claims, and drawings inwhich? Fig. lis aplanview of one formrof. the invention;

Fig. 2 is ;a side elevational View looking' fromthe leftinFig, 1;.

Fig. 3 is a sectional. view taken substantially along the line .,33 of Fig. 1;

Fig. 4. is a sectional view taken substantially alongthe line 4-4 of Fig. 2;

Fig. 51s a. perspective view of the supporting mechanismior th coil forms;

Fig. 6 is aplan view of another form of the invention;

Fig. 7 is aside elevational view taken from the right of Fig. 6;

Fig. 8 is a sectional view taken substantially along the line 88- of Fig. 6; and

Fig. 9 is an enlarged sectional view takensub stantially along the line 9-l-lof Fig. 6.-

Referring to the form of the invention illustrated in Figs. 1 to 5, the permeability tuning mechanism is generally designated. at. l:0.. It: in.- cludes a frame having a bottom Wall ll andend walls iZand t3; preferably made of sheet metal. sidewalls liand 45', preferably maden of insulating material, rest upon the bottom. wall I I. and are secured to the end walls l2 and. 1&3 by means of ears l5; ll and it, struck from: the end' walls [2 and it and the bottom wall M respectively;

In this form of the invention .two coil. forms Bil -are utili ed. These coil forms are. made of insulating material and are secured to end sup-. porting pieces and: 22, also madeof' insulating material. A strap 23- of insulating material emcompasses the end supporting piece'22: andis secured to the suppo't'tingrpiece 21; The. coil forms 2i! thussnpported are seoured'to: the end wall E2 of the frame by ears 2'4 and 25 struck from the bottom wall H and the'end wall-I2 respectively, as illustrated in Fig. 3. The ears and Edclamp the end supporting piece 2 2 in place against the end wall E2. Thus thecoil forms: 20

are securely-held in place in the frame parallel to theside walls 5 5 and-l5 of the'frameand' between the same.

The coil formsiil inductance windings and the inductance o1" thes windings is varied by means of longitudinally moving-ferro-magnetio cores 2'5 received'in'the-coil forms 20. The cores 2"! are connected by screw threadedrods: 28 to a cross-head 29 preferably formed? of insulat- The cross-head 249 is i ormedi with tapped holes for receiving the screw threaded rods 28 and the positions of the cores '21 with respect to the cross-head 29 may be adjusted by manipulating the flattened ends 30 of the screw threaded rods 29. In this way the inductance of the coils may be relatively adjusted.

The cross-head 29 is secured to angle brackets 3| by means of lugs 32 carried by the brackets. The angle brackets 3| ride on the upper edges of the side walls l4 and I and are provided with ears 33 extending into slots 34 in the side walls l4 and I5. The cross-head and brackets are thereby guided for longitudinal movement along the side walls 14 and I5. The brackets 3| are also provided with extensions 35 having notches 36 and 31 at the ends thereof. The extensions 35, which extend along the side walls l4 and I5, are at least as long as the longitudinal movement to be imparted to the cores 21.

A shaft 4|! is journaled in suitable holes in the side walls I4 and I5 and the shaft has secured thereto a pair of drums 4| and 42, which drums are in alignment with the extensions 35 and are located between the ends 36 and 31 of the extensions 35. The flanges of the drums 4| and 42 are provided with openings 43 and diametrically opposite the openings 43 the drums are provided with ears 44. Flexible bands 45, preferabl in the form of cords, are secured in the notch 35 of the extensions 35, are wrapped about the drums 4| and 42, and are secured to the notches 31 in the extensions 35. Where the flexible band 45 traverses the hole 43 in the flange of the drums 4| and 42, it is drawn inwardly through the hole and is connected to a spring 46 attached to the ear 44. The spring 48 operates to tension the flexible band 45 and also to secure it to the drums 4| and 42.

The side wall |5 adjacent the drum 42 is provided with an arcuate slot 41 for receiving a lug 48 struck from the drum 42. The lug 48 cooperates with the arcuate slot 4! to limit rotation of the shaft 40 and hence limit the extent of longitudinal movement of the cross-head 29 and cores 21.

When the shaft 48 is rotated, the drums 4| and 42 and the flexible bands 45 impart longitudinal movement to the cross-head 29 and hence to the cores 21. Since the cross-head 29 is guided by the angle brackets 3| and is positively driven at each end by the pair of flexible bands 45, the cross-head 29 is at all times maintained at right angles to the side walls I4 and I5 so that identical motions are imparted to the cores 21.

In the other form of the invention, illustrated in Figs. 6 to 9, the permeability tuning mechanism is generally designated at 58. It includes a frame preferably formed of sheet metal, having a bottom wall 5| and end walls 52 and 53. Side walls 54 and 55, preferably made of insulating material are secured to the end walls 52 and 53 by lugs 56 and 51 formed on the side walls. A strip of insulating material 58 is secured to the inside of the end wall 52 by screws 59 and connecting lugs 60. The strip 58 is provided with inwardly extending lugs 5| struck therefrom for receiving the ends of coil forms 62. The coil forms 62 are inserted in the lugs SI and are held in place therein by cement or other suitable adhesive material. The coil forms 62 are thus supported by the frame between the side walls thereof and parallel to the side walls. The coil form 62 may be provided with the usual inductance windings, the inductance of which may be varied by ferro-magnetic cores 65 received in the coil forms 62.

The cores 65 are provided with screw threaded rods 86 received in tapped holes in a cross-head 61, preferably made of insulating material. The positions of the cross 65 with respect to the crosshead 61 may be relatively adjusted by manipulation of the flattened ends 68 of the rods 66.

To add strength to the cross-head 61, it may be provided with an angle reinforcing member 69 which prevents bending of the cross-head. The cross-head 61 is provided with extensions 61 extending between the bottom wall 5| and the side walls 54 and 55 whereby the cross-head is guided in its longitudinal movement. Side strips 10, also preferably formed of insulating material, are secured to the cross-head 5'2 by means of ears 1|, the side strip 18 being parallel to and lying adjacent to the side walls 54 and 55. These side strips 10 also slide along the bottom wall 5| of the frame. Brackets 12 are secured to the side strips 10 by means of ears 13 and the brackets 12 are each provided with an extension 14 having end slots 15 and re. The length of the extension 14 is at least as long as the movement to be imparted to the cores 65. The extensions 14 may also be provided with ears 11 extending underneath and engaging the outer sides of the side walls 54 and 55 to assist in guiding the longitudinal movement of the cross-head 61. The end wall 52 and the strip 58 may be provided with suitable openings to permit the extension 14 to pass therethrough when the cores 65 are moved longitudinally into the coil forms 62.

A shaft 88 is suitably journaled in holes in the side walls 54 and 55 and the shaft 89 has secured thereto drums 8| and 82 inside of and adjacent to the side walls 54 and 55. The drums 8| and 82 are in alignment with the extensions 14 and are located between the ends 15 and 15 thereof. The flanges of the drums are provided with openings 83 and lugs Flexible bands 85 are secured at one end in the slots 15, are wrapped about the drums 8| and and are secured at their other ends in the slots 15. Where the flexible bands 35 traverse the holes in the drums 8! and 82, they are drawn therethrough and connected by springs 86 to the lugs 84. The springs 85 operate to tension the flexible bands 85 and to secure them to the drums 8| and Thus when the shaft 88 is rotated the flexible bands 85 and extensions 14 impart longitudinal movement to the cross-head 61 and the cores 85. The shaft 88 may be provided with washers 81 adjacent the side walls 54 and 55 held in place by cotter pins 88 to prevent longitudinal movement thereof with respect to the side walls 54 and 55.

The side wall 55 adjacent the drum 82 is preferably provided with an arcuate slot 98 for receiving a lug 9| struck from the drum 82. The slot 90 and lug 8| operate to limit the rotative movement of the shaft 88 and hence the longitudinal movement of the cross-head. G1 and cores 65.

By reason of the foregoing mechanism, the cross-head 61 in its longitudinal movement is guided by the bottom wall 5| and the side walls 54 and 55 of the frame, and since the ends of the cross-head 51 are both positively driven by the bands 85, the cross-head is at all times maintained at right angles to the side walls 54 and 55 to impart equal increments of movement to the cores 65.

While for purposes of illustration, two forms of this invention have been disclosed, other forms thereof may become apparent to those skilled in the art upon reference to this disclosure, and, therefore, this invention is to be limited only by the scope of the appended claims and prior art.

I claim as my invention:

1. In a radio tuning device, an operating mechanism for converting rotary motion to rectilinear motion and for synchronously moving a plurality of tuning members rectilinearly with respect to a plurality of corresponding members parallelly supported by a supporting frame, said operating mechanism comprising, a supporting frame, side walls on the supporting frame parallel to said members, a cross-head extending transversely of and mounted for movement longitudinally of said side walls, rods connecting said cross-head to the tuning members, a pair of parallel extensions on said cross-head adjacent said side walls and at least as long as the longitudinal movement of the cross-head, a shaft extending between said side walls, a pair of drums secured to the shaft in alignment with said cross-head extensions and between the ends thereof, and a flexible band around each of said drums and connected to the ends of the associated cross-head extensions for imparting equal longitudinal movement to the ends of the cross-head upon rotary movement of the shaft.

2. In a radio tuning device, an operating mechanism for converting rotary motion to rectilinear motion and for synchronously moving a plurality of tuning members rectilinearly with respect to a plurality of corresponding members parallelly supported by a supporting frame, said operating mechanism comprising, a supporting frame, side walls on the supporting frame parallel to said members, a cross-head extending transversely of and mounted for movement longitudinally of said side walls, rods connecting said cross-head to the tuning members, a pair of parallel extensions on said cross-head adjacent said side walls and at least as long as the longitudinal movement of the cross-head, a shaft extending between said side walls, a pair of drums secured to the shaft in alignment with said cross-head extensions and between the ends thereof, a flexible band around each of said drums and connected to the ends of the associated cross-head extensions for imparting equal longitudinal movement to the ends of the cross-head upon rotary movement of the shaft, and spring means for tensioning the flexible bands and securing the same to the drums.

3. In a radio tuning device, an operating mechanism for converting rotary motion to rectilinear motion and for synchronously moving a, plurality 'of tuning members rectilinearly with respect to a plurality of corresponding members parallelly supported by a supporting frame, said operating mechanism comprising, a supporting frame, side walls on the supporting frame parallel to said members, a cross-head extending transversely of and mounted for movement longitudinally of said side walls, rods connecting said cross-head to the tuning members, a pair of parallel extensions on said cross-head adjacent said side walls and at least as long as the longitudinal movement of the cross-head, a shaft extending between said side walls, a pair of drums secured to the shaft in alignment with said cross-head extensions and between the ends thereof, a flexible band around each of said drums and connected to the ends of the associated cross-head extensions for imparting equal longitudinal movement to the ends of the cross-head upon rotary movement of the shaft, an arcuate slot in the side wall adjacent one of the drums, and a projection on the drum extending into the areuate slot for limiting ro tation of the shaft.

4. In a radio tuning device, an operating mechanism for converting rotary motion to rectilinear motion and for synchronously moving a plurality of tuning members rectinilearly with respect to a plurality of corresponding members parallelly supported by a supporting frame, said operating mechanism comprising, a supporting frame, side walls on the supporting frame parallel to said members, a cross-head extending transversely of and mounted for movement longitudinally of said side walls, ears on the cross-head engaging the side walls to prevent tilting of the cross-head, rods connecting said cross-head to the tuning members, a pair of parallel extensions on said cross-head adjacent said side walls and at least as long as the longitudinal movement of the cross-head, a shaft extending between said side walls, a pair of drums secured to the shaft in alignment with said cross-head extensions and between the ends thereof, and a flexible band around each of said drums and connected to the ends of the associated cross-head extensions for imparting equal longitudinal movement to the ends of the cross-head upon rotar movement of the shaft.

WILLIAM A. SCI-IAPER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,217,984 Kirk Oct. 15, 1940 2,255,680 Sands Sept. 9, 1941 2,260,985 Benton Oct. 28, 1941 2,338,134 Sands Jan. 4, 1944 

